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| LTC4417_15 Datasheet, PDF (6/32 Pages) Linear Technology – Prioritized PowerPat Controller | |||
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LTC4417
Typical Performance Characteristics
VVALID(OL) vs Pull-Up Current
0.5
0.4
0.3
0.2
0.1
0
0
0.5
1.0
1.5
2.0
PULL-UP CURRENT (mA)
4417 G10
VOUT Switching from Higher to
Lower Voltage
V2
2V/DIV
V1
VOUT
100µs/DIV
CL = 122µF
IL = 1A
â40V PCH FDD4685
4417 G13
VOV,UV vs Temperature
1.04
Deglitched Connection
1.03
VUV(RISING)
1.02
1.01
V2
2V/DIV
VOUT
1.00
VOV,UV(THR)
0.99
0.98
VOV(FALLING)
0.97
0.96
â50 â25
0 25 50 75
TEMPERATURE (°C)
100 125
4417 G11
V1
100ms/DIV
CL = 122µF
IL = 1A
â40V PCH FDD4685
4417 G12
VOUT Switching from Lower to
Higher Voltage with Slew Rate
Control Circuitry
Reverse Voltage Blocking
V2
2V/DIV
V1
2V/DIV
VOUT
V2, VOUT
10V/DIV
V1 = 20V
IVOUT
5A/DIV
20µs/DIV
RS = 1.43kΩ
CS = 6.8nF
CL = 100µF
IL = 1A
â40V PCH FDD4685
4417 G14
V1 = â20V
5µs/DIV
CL = 122µF
IL = 1A
â40V PCH FDD4685
4417 G15
Pin Functions
CAS: Cascade Output. Digital output used for cascad-
ing multiple LTC4417s. Connect CAS to EN of another
LTC4417 to increase the number of multiplexed input
supplies. CAS is pulled up to the internal VLDO voltage
by an internal 20µA current source to indicate when all
inputs are invalid, the external P-channel MOSFETs are
determined to be off, and EN is above 1V. CAS also pulls
high when SHDN is driven below 1V. CAS is pulled low
when any input supply is within the OV/UV window for at
least 256ms and both SHDN and EN are above 1V. CAS
also pulls low when EN is driven below 1V. CAS can be
driven to 5.5V independent of the input supply voltages.
Leave open if not used.
6
EN: Channel Enable Input. EN is a high voltage input that
allows the user to quickly connect and disconnect chan-
nels without resetting the OV/UV timers. When below 1V,
all external back-to-back P-channel MOSFETs are driven
off by pulling G1, G2 and G3 to their respective VS1, VS2
and VS3. When above 1V, the highest valid priority chan-
nel is connected to the output. EN is pulled to the internal
VLDO voltage with a 2µA current source and can be pulled
up externally to a maximum voltage of 36V. Leave open
when not used.
Exposed Pad (UF Package Only): Exposed pad may be
left open or connected to device ground.
4417f
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